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Recycled colourless soda-lime-silica glass as an alternative flux in whitewares.

机译:再生的无色钠钙硅玻璃可作为白色陶瓷的替代助熔剂。

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摘要

The most common type of container glass which is landfilled in the UK is soda-limesilica glass, comprising typically 7I-75wt% silica, 12-I6wt% soda and 1O-15wt% lime. Considering its chemical similarity to that of the fluxing materials commonly used in whiteware bodies, it is sensible to investigate the use of SLS waste glass as replacement for these fluxes in whitewares. The present study aimed at the incorporation of colourless SLS waste glass into a standard whiteware formulation (Le. 50wt% kaolinite clay, 25wt% quartz and 25wt% nepheline syenite) as a flux, and at the examination of the microstructural development on firing. Bulk samples with two (e.g. clay and quartz, SLS glass and clay, etc.), three (standard and fully SLS-fluxed whiteware) and four (mixed nepheline syenite SLS glass as flux system) components were studied in depth. After firing 3h at 1100°C, batches containing 6.25wt% SLS glass and 18.75wt% nepheline syenite attained open-pore closure and a bulk density of 2.40 g/cm3 , comparable to that of the standard body fired at 1200°C. SLS glass softens and melts, conferring early densification and overfiring on whitewares fired at commercially-applied firing temperatures. Severe bloating ruled out the use of higher amounts of SLS glass. The microstructural evolution examined using XRD, SEMlEDS, and TEMIEDS revealed the formation of a variable composition plagioclase, wollastonite, and cristobalite in batches containing SLS glass, in addition to primary and secondary mullites, partially dissolved quartz, and a glassy matrix as found in the standard whiteware. Na+ and Ca2+ions from SLS glass migrate towards clay mineral relicts to form plagioclase, limiting the extent of mullite crystallization in SLS containing batches. Wollastonite and cristobalite crystallize from the devitrification of SLS glass. The flexural strength of the body containing 6.25wt% SLS glass fired at 1l00°C (-71.2 MPa) was higher, modulus of elasticity slightly lower, and fracture toughness comparable to those of the standard whiteware body fired at 1200°C. The Weibull modulus of the partially SLS-fluxed whiteware was lower due to the presence of crystals inhomogeneously distributed over a complex microstructure. From the physical and mechanical properties investigated in this study, SLS glass can be used as part of the fluxing system of some fully densified whitewares.
机译:在英国,最常见的集装箱玻璃是苏打石灰玻璃,通常包含7I-75wt%的二氧化硅,12-I6wt%的苏打和1O-15wt%的石灰。考虑到它与白瓷器皿中常用的助熔剂的化学相似性,因此有必要研究使用SLS废玻璃代替白瓷器中的这些助熔剂。本研究旨在将无色SLS废玻璃以助熔剂的形式掺入标准的白色器具配方中(例如50wt%的高岭石粘土,25wt%的石英和25wt%的霞石正长岩),并研究烧成后的微观结构发展。深入研究了具有两种成分(例如粘土和石英,SLS玻璃和粘土等),三种成分(标准和完全SLS助熔的白色陶瓷)和四种成分(混合霞石正长SLS玻璃作为助熔剂系统)的大块样品。在1100°C烧制3h后,包含6.25wt%SLS玻璃和18.75wt%霞石正长岩的批次达到了开孔封闭,堆积密度为2.40 g / cm3,与在1200℃下燃烧的标准物体相当℃。 SLS玻璃软化并融化,赋予在商用烧制温度下烧制的白色陶瓷早期致密化和过度烧制。严重的腹胀排除了使用大量SLS玻璃的可能性。使用XRD,SEMlEDS和TEMIEDS检查的微观结构演变表明,除了主要和次要莫来石,部分溶解的石英以及玻璃状基质外,含SLS玻璃的批次中还形成了可变成分的斜长石,硅灰石和方石英。标准的白色软件。来自SLS玻璃的Na +和Ca2 +离子向粘土矿物遗迹迁移,形成斜长石,限制了含SLS批次中莫来石结晶的程度。硅灰石和方石英从SLS玻璃的失透中结晶出来。包含在1.100°C(-71.2 MPa)焙烧的6.25wt%SLS玻璃的物体的弯曲强度更高,弹性模量稍低,并且断裂韧性与在1200°C焙烧的标准白色陶瓷物体相当C。由于存在复杂的微结构上不均匀分布的晶体,部分SLS助焊的白色陶瓷的威布尔模量较低。从本研究中研究的物理和机械性能来看,SLS玻璃可以用作某些完全致密的白色陶瓷的助熔剂系统的一部分。

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    Tarvornpanich Tarnkamol;

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